Measurement of the (anti-)${}^3$He elliptic flow in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

Abstract

The elliptic flow ($v_2$) of (anti-)${}^3$He is measured in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV in the transverse-momentum ($p_{\mathrm{T}}$) range of 2-6 GeV/$c$ for the centrality classes 0-20%, 20-40%, and 40-60% using the event-plane method. This measurement is compared to that of pions, kaons, and protons at the same center-of-mass energy. A clear mass ordering is observed at low $p_{\mathrm{T}}$, as expected from relativistic hydrodynamics. The violation of the scaling of $v_2$ with the number of constituent quarks at low $p_{\mathrm{T}}$, already observed for identified hadrons and deuterons at LHC energies, is confirmed also for (anti-)${}^3$He. The elliptic flow of (anti-)${}^3$He is underestimated by the Blast-Wave model and overestimated by a simple coalescence approach based on nucleon scaling. The elliptic flow of (anti-)${}^3$He measured in the centrality classes 0-20% and 20-40% is well described by a more sophisticated coalescence model where the phase-space distributions of protons and neutrons are generated using the iEBE-VISHNU hybrid model with AMPT initial conditions.

24 pages, 8 captioned figures, 2 tables, authors from page 19, published version, figures at http://alice-publications.web.cern.ch/node/5609

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Cited by in corpus (8)

• Multiplicity Scaling of Light Nuclei Production in Relativistic Heavy-Ion Collisions
• Production of (anti-)${}^3$He and (anti-)${}^3$H in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Elliptic and triangular flow of (anti)deuterons in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Enhanced deuteron coalescence probability in jets
• Momentum dependence of light nuclei production in pp, p-Pb and Pb-Pb collisions at the CERN Large Hadron Collider
• Measurement of the production of (anti)nuclei in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV
• Measurement of the low-energy antitriton inelastic cross section
• Rapidity dependence of antideuteron coalescence in pp collisions at $\sqrt{s}$ = 13 TeV with ALICE